Botany: insectivorous plants, acid bogs.
In the Apg2 classification Droseracaeae and allied families are included in the Poygonales. They were already closely related to Caryophyllales and in the Apg3 classification they became included in
Caryophyllales. Droseracaeae and allied families form a clade within Polygonales.
In the Plant theory Droseracaeae and allied families are treated as an Order Droserales and placed in Phase 7 of the Subclass Caryophyllidae. Droserales are mostly carnivorous plants. The placement in Subphases is tentative.
1. Aldrovandaceae: Aldrovanda vesiculosa, waterwheel plant, free floating aquatic plant; only 50 confirmed extant populations worldwide.
2. Dioncophyllaceae: 3 genera; 3 species: Triphyophyllum peltatum, Habropetalum dawei, Dioncophyllum thollonii; lianas; rainforests; western Africa; carnivorous
3. Drosophyllaceae: 1 genus, 1 species, Drosophyllum lusitanicum; carnivorous; dry, alkaline soils; Portuguese Sundew or Dewy pine; glandular leaves, uncoil from a central rosette, coiled outward when immature; sweet aroma; sticky mucilage, ensnaring, < struggle, dying of suffocation or exhaustion.
7. Ancistrocladaceae: Ancistrocladus; 12 species; lianas; tropics of the Old World; non-carnivorous. The Cronquist system, 1981, placed the family in the order Violales, together with Dioncophyllaceae. The Takhtajan system placed the family in its own order Ancistrocladales.